Arsenal came from behind to see off the challenge of Koln and secure their first victory in the Europa League with an impressive second half performance at the Emirates.
The German club started quickly, taking the lead with a stunning Jhon Cordoba strike inside ten minutes. And for much of the first 45 minutes, they successfully restricted a lacklustre Arsenal outfit.
But after half-time, the home side significantly upped their game, goals from substitute Sead Kolasinac, Alexis Sanchez and Hector Bellerin securing an ultimately comfortable win.
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After an hour-long delay due to crowd trouble, the game finally began at a high tempo, the atmosphere heightened by the events prior to kick-off and the enthusiasm of the raucous away supporters.